Posts referring to the projectiondesign F1 SXGA

Hi.
We have five F1+SXGA of Projection Design at Malargüe Planetarium. http://www.projectiondesign.com/admin/common/GetImg.asp?FileID=1140
Suddenly, one of them started to look with a background black very bright.
We tried to change the color values from menu projector and it looks like if the projector recognize the values only when we move the numbers to change the colors. It looks like if when we move one point
in one color, this color is adjusted to the first value at this moment.
Anyway, is very bright yet.
Is there some specific part inside that could be failing? I hope to be clear with the symptom.
I would thank an answer soon, we have to decide today if we close the planetarium to fix the problem
or not.
Thank you very much!
Best,
Andres